JPS6118985Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to an electric circular saw.

(Prior Art) For example, ALC panels AP, which are known as exterior wall materials for houses, are used by being cut to a required size and then interconnected. During this joining process, caulking material (CO) for adhesion is injected into the cut end surface of the ALC panel AP.
It is necessary to perform predetermined groove processing in advance. Conventionally, this groove machining was done manually using a chamfer plane or the like.

(Problem that the invention aims to solve) Therefore, the work is complicated and the work time is delayed;
There was also a problem in that the groove shapes had to be irregular.

In view of the above, an object of the present invention is to provide an electric circular saw that can perform predetermined grooving at the same time as cutting.

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration. That is, on at least one side of the circular saw blade that cuts the aerated concrete panel, a chamfer cutter with a rotational outer diameter smaller than the rotational outer diameter of this blade is installed in parallel, and a set of chamfers is installed on the tip of the chamfer cutter. The chips are arranged in substantially symmetrical positions, and the double-sided chips are arranged in substantially symmetrical positions, and the double-sided chips are formed into a groove forming part MK that can form a caulking groove with a channel-shaped cross section, and a chamfer of the caulking groove. In order to do this, it was decided to form an amplifying part ZF which is continuous from the base end of the groove forming part MK and is formed in a tapered shape so that the width of the groove increases toward the inner end of the chamfered tip.

(Example) Hereinafter, an example embodying the present invention will be described in detail with reference to the drawings.

In the drawing, 1 is the entire circular saw, 2 is a motor case containing the motor, and 3 is a gear case that is connected to the motor case 2 and contains a reduction mechanism that connects the driving shaft of the motor and the spindle 9 of the blade 12. be. A blade case 4 having a semicircular ring shape and a groove-shaped cross section opening on the lower side is integrally formed on the front surface of the gear case 3, and the upper edge side of the blade 12 is covered by the blade case 4. .

A base 5 is formed in a flat plate shape and is placed on the top surface of the panel AP to stabilize the circular saw 1 during cutting operations. It is attached so as to surround the four peripheries of the case 4, and rollers 7 to 7 are attached to the outside of the four corners via bushes 6.
is mounted so that it can roll. Furthermore, a roller 7 is similarly installed at the center of the front side shown in FIG.
Even after the cutting of the AP is completed, it remains on the panel AP and prevents the circular saw 1 from tilting downward (tilting forward).

8 is a flat blade cover fastened to the front surface of the blade case 4.

Next, a device for cutting, chamfering, etc. using the circular saw 1 will be explained.

A spindle 9 connected to a speed reduction mechanism within the gear case 3 protrudes within the blade case 4 and is rotatably supported by a shaft 10 . In addition, the square shaft portion 9a formed at the tip of the spindle 9 has a square tube portion 1 on one side.
A disc-shaped inner flange 11 having a shape of
One blade 12 and two chamfered cutters 13, 13' are fitted in a superimposed state with the blade 12 in the middle, and these blades 12 and chamfered cutters 13, 13' are fitted to the inner flange 11.
The spindle 9 is held concentrically by the outer flange 16 and the outer flange 16. The outer flange 16 is fastened by a mounting screw 14 screwed onto the square shaft portion 9a of the spindle 9 via a washer 15 or the like.

The chamfered cutters 13 and 13' provided on both the left and right sides of the cutting blade 12 are formed in the same shape and are attached in the same phase, and their rotational outer diameter is the same as the rotational outer diameter of the blade 12. is set smaller. Next, each chamfering cutter 13, 13' will be explained with reference to FIGS. 5 to 9. The chamfering cutter 13, 13' has a circular base K formed in its center and Knife-shaped protrusions T, T having arcuate outer peripheral edges with a phase difference of 180° are formed integrally protruding in the radial direction. In addition, each protrusion T,
Chamfering chips MC, MC formed in the same shape are fixed to the tips of the end faces of the T so as to protrude outward, and their shapes are as shown in the drawings. That is, the chamfered chip MC has a predetermined side clearance angle C on the circumferential side (upper side in FIG. 7) of the end surface ST on the cutting side, and has a groove forming part MK for forming the caulking groove CM. Draw path width L from the groove forming part MK to the inner end of the chamfered tip MC (lower end in Fig. 7)
A tapered amplifying section ZF such that the amplifying section ZF increases is continuously formed, and the chamfering MT can be performed by the amplifying section ZF. In addition, as an example of a chamfered chip MC, in this example the rake angle is set at 0°,
The cutting side end surface ST of the chamfered chip MC and the end surface of the protruding piece T are on the same plane. In addition, chamfered chips
MC has a relief angle a of 15 degrees, a tip relief angle b of 5 degrees, a side relief angle c formed by the outer surface of the groove forming part MK with respect to the axis of the chamfered cutters 13 and 13' of 1 degree to 2 degrees, and a relief angle d. are set at 5°.

Therefore, when the chamfered cutters 13, 13' configured as described above are attached to the rectangular tube portion 11a, the base K is used to easily determine the directionality thereof.
A square hole TH for mounting is provided in the center.

Note that 17 is a channel-shaped safety cover for covering the lower edge side of the blade 12, and is rotatably attached to the outer circumference of the bearing 10 of the spindle 9. The roller 18 provided on the panel AP can be retracted into the blade case 4 by coming into contact with the panel AP. Further, 19 is a grip portion, and 20 is a dust discharge tube which is provided upright in a part of the blade case 4 and is used to discharge cutting dust during cutting operations.

Subsequently, the effects of this embodiment configured as described above will be explained.

When cutting the panel AP along a cutting line that has been laid down in advance at a desired position, the circular saw 1 is advanced along the line. At this time, the circular saw 1 is smoothly advanced by the rolling of the rollers 7 to 7 provided on the base 5, and the safety cover 17 is retracted into the blade case 4. Simultaneously with the cutting operation by this blade 12, the surface side of the cut end of the panel AP is chamfered MT and caulking groove CM, which have a cross-sectional shape symmetrical about the cutting line, using double-sided cutters 13 and 13'. is formed, and this chamfering etc. is completed at the same time as the cutting is completed. However, since the chamfers of the panel AP that have been cut and chamfered as described above are completely symmetrical, the jointing during construction is extremely good, and the caulking material
The seams can be finished neatly.

As described above, in this embodiment, processing such as chamfering can be performed at the same time as cutting the panel AP, so unlike the conventional method, two processes such as cutting and chamfering can be completed in one process.
It has the advantage of significantly shortening work time.

In addition, as mentioned above, the roller 7 at the center of the front side in the figure
Since the blade 12 is displaced rearward from the center of rotation of the blade 12, impact or danger due to the entire circular saw 1 falling forward immediately after cutting is completed is prevented.

In this example, the double-sided chamfered cutters 13 and 13' are in the same phase, that is, their chamfered chips MC~
Although the MCs are arranged in the same phase, they may be arranged in different phase positions.

(Effects of the Invention) As described above, according to the present invention, a predetermined groove can be formed with a chamfer cutter at the same time as cutting with a circular saw blade. That is,
A channel-shaped caulking groove is formed in the groove forming part, and a tapered chamfer continuous with the caulking groove is formed in the amplifying part at the same time as cutting. Therefore, it is possible to achieve the excellent effect of shortening the working time and making the groove shape uniform.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view of a circular saw, Fig. 2 is a side sectional view showing the main parts of the invention, and Fig. 3 is an exploded perspective view of the main parts. figure,
Figure 4 is an explanatory diagram showing the construction state of the object to be cut, Figure 5
The figure is a side sectional view of the chamfering cutter, Fig. 6 is a front view of the same, Fig. 7 is a side view of the chamfering tip, Fig. 8 is a front view of the same, and Fig. 9 is a sectional view taken along the line X-X of Fig. 7. be. 1... Circular saw, 12... Blade, 13, 13'
...Beveled cutlet.

Claims (1)

[Scope of utility model registration request] At least one side of the circular saw blade for cutting the aerated concrete panel is provided with a chamfer cutter having a rotational outer diameter smaller than the rotational outer diameter of this blade, and a set of chamfer chips is provided at the tip of the chamfer cutter. The double-sided chamfered tips are arranged in almost symmetrical positions, and are connected to a groove forming part MK that can form a caulking groove with a channel-like cross section, and a groove forming part MK that is continuous from the base end of the groove forming part MK to chamfer the caulking groove. An electric circular saw for an aerated concrete panel, characterized in that it is formed from an amplifying part ZF formed in a tapered shape so that the cutting path width increases toward the inner end of the chamfered tip.